a{
    text-decoration: none;
}
*{padding:0;margin: 0;}
.main-frame{
    width:750px;
    height: 1330px;
    display: flex;
    flex-direction: column;
    margin: 0 auto;
    padding-top:130px;
    background: #fff;
    border: 1px solid #333;
    box-sizing: border-box;
}
.top-frame{
    display:flex;
    justify-content: center;
    align-items: center;
    background: url('../images/bg.jpg');
    height:450px;
    background-size: cover;
}
.content-frame{
    padding:45px 35px;
    padding-bottom: 30px;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-around;
    align-content: space-between;
    height: auto;
}
.content{
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    height: 370px;
}
.content>img{
    width: 200px;
    height: 270px;
}
.content-grade{
    display: flex;
    align-items: flex-start;
}